Get 'incompatible stubs mechanism' error running tkinterdnd2 on Monterey (MacOS 12.7)

[eric-gilbertson]

Any tips on how to get TkInterDnD2 to work with Monterey (12.7.6)? It was working on Catalina but it stopped working after upgrading to Monterey. With it I get the following startup exception:

_(venv) 657: python3 ghdrag3.py
Traceback (most recent call last):
File "/Users/barbara/src/ytdownloader/venv/lib/python3.13/site-packages/tkinterdnd2/TkinterDnD.py", line 69, in _require
TkdndVersion = tkroot.tk.call('package', 'require', 'tkdnd')
tkinter.TclError: interpreter uses an incompatible stubs mechanism

I get this exception both with the prebuilt version of libtkdnd.dylib for Monterey and with a version I built on the target machine with cmake. I suspected that it might be a mixup between Tcl versions but my box has only Tcl8.5 on it, so I don't think that is the problem.